Precision molecular spectroscopy with a phase-locked terahertz quantum-cascade laser
Artikel i vetenskaplig tidskrift, 2025

We demonstrate precision molecular spectroscopy with a phase-locked quantum cascade laser (QCL) over its entire frequency tuning range at 3.4 THz. A Schottky diode harmonic mixer is used to mix the QCL emission with a multiplied microwave signal, referenced to a rubidium frequency standard, to create an intermediate frequency (IF) signal, which is used to phase-lock the QCL. Tuning the frequency of the multiplied microwave reference and keeping the IF fixed allows for precise frequency control of the laser. We identify ten methanol transitions between 3443.5 and 3447.6 GHz and quantify the transition frequencies and broadening parameters with high precision. These measurements are performed without liquid cryogens in a compact setup.

Författare

Robert Voigt

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Martin Wienold

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Divya Jayasankar

Terahertz and Millimetre Wave Laboratory

Jan Stake

Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik

Xiang Lü

Paul Drude Institut fur Festkorperelektronik

Klaus Biermann

Paul Drude Institut fur Festkorperelektronik

Heinz-Wilhelm Hübers

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Optics Express

1094-4087 (ISSN) 10944087 (eISSN)

Vol. 33 7 15782-15788

Supraterahertzelektronik för framtida FIR instrument

Rymdstyrelsen (2023-00310), 2024-01-01 -- 2027-12-31.

Infrastruktur

Kollberglaboratoriet

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier (SSIF 2025)

Elektroteknik och elektronik

DOI

10.1364/OE.553739

Mer information

Senast uppdaterat

2025-04-02